A255274 - cp's OEIS frontend

A255274 From Goldbach conjecture: Consider the pairs (2n-+1, 3), (2n-1, 5), (2n-3, 7), ..., (3, 2n+1) of odd numbers having sum 2n+4; a(n) is the index of the first pair of primes (p, q) on the list.

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	1
7	2
8	1
9	1
10	2
11	1
12	2
13	3
14	1
15	1
16	2
17	3
18	1
19	2
20	1
21	1
22	2
23	1
24	2
25	3
26	1
27	2
28	3
29	1
30	1
31	2
32	3
33	1
34	2
35	1
36	1
37	2
38	3
39	1
40	2
41	1
42	2
43	3
44	1
45	2
46	3
47	9
48	1
49	2
50	1
51	1
52	2
53	1
54	1
55	2
56	1
57	2
58	3
59	6
60	5
61	6
62	9
63	1
64	2
65	1
66	2
67	3
68	1
69	1
70	2
71	3
72	5
73	5
74	1
75	1
76	2
77	3
78	1
79	2
80	3
81	1
82	2
83	1
84	2
85	3
86	1
87	2

[1, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 2, 3, 1, 1, 2, 3, 1, 2, 1, 1, 2, 1, 2, 3, 1, 2, 3, 1, 1, 2, 3, 1, 2, 1, 1, 2, 3, 1, 2, 1, 2, 3, 1, 2, 3, 9, 1, 2, 1, 1, 2, 1, 1, 2, 1, 2, 3, 6, 5, 6, 9, 1, 2, 1, 2, 3, 1, 1, 2, 3, 5, 5, 1, 1, 2, 3, 1, 2, 3, 1, 2, 1, 2, 3, 1, 2]

cp's OEIS Frontend

A255274 From Goldbach conjecture: Consider the pairs (2n-+1, 3), (2n-1, 5), (2n-3, 7), ..., (3, 2n+1) of odd numbers having sum 2n+4; a(n) is the index of the first pair of primes (p, q) on the list.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	1
7	2
8	1
9	1
10	2
11	1
12	2
13	3
14	1
15	1
16	2
17	3
18	1
19	2
20	1
21	1
22	2
23	1
24	2
25	3
26	1
27	2
28	3
29	1
30	1
31	2
32	3
33	1
34	2
35	1
36	1
37	2
38	3
39	1
40	2
41	1
42	2
43	3
44	1
45	2
46	3
47	9
48	1
49	2
50	1
51	1
52	2
53	1
54	1
55	2
56	1
57	2
58	3
59	6
60	5
61	6
62	9
63	1
64	2
65	1
66	2
67	3
68	1
69	1
70	2
71	3
72	5
73	5
74	1
75	1
76	2
77	3
78	1
79	2
80	3
81	1
82	2
83	1
84	2
85	3
86	1
87	2

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	1
7	2
8	1
9	1
10	2
11	1
12	2
13	3
14	1
15	1
16	2
17	3
18	1
19	2
20	1
21	1
22	2
23	1
24	2
25	3
26	1
27	2
28	3
29	1
30	1
31	2
32	3
33	1
34	2
35	1
36	1
37	2
38	3
39	1
40	2
41	1
42	2
43	3
44	1
45	2
46	3
47	9
48	1
49	2
50	1
51	1
52	2
53	1
54	1
55	2
56	1
57	2
58	3
59	6
60	5
61	6
62	9
63	1
64	2
65	1
66	2
67	3
68	1
69	1
70	2
71	3
72	5
73	5
74	1
75	1
76	2
77	3
78	1
79	2
80	3
81	1
82	2
83	1
84	2
85	3
86	1
87	2

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	1
7	2
8	1
9	1
10	2
11	1
12	2
13	3
14	1
15	1
16	2
17	3
18	1
19	2
20	1
21	1
22	2
23	1
24	2
25	3
26	1
27	2
28	3
29	1
30	1
31	2
32	3
33	1
34	2
35	1
36	1
37	2
38	3
39	1
40	2
41	1
42	2
43	3
44	1
45	2
46	3
47	9
48	1
49	2
50	1
51	1
52	2
53	1
54	1
55	2
56	1
57	2
58	3
59	6
60	5
61	6
62	9
63	1
64	2
65	1
66	2
67	3
68	1
69	1
70	2
71	3
72	5
73	5
74	1
75	1
76	2
77	3
78	1
79	2
80	3
81	1
82	2
83	1
84	2
85	3
86	1
87	2